The first two wave types, P and S, are called body waves because they travel or propagate through the body of Earth. The latter two are called surface waves they the travel along Earth's surface and their amplitude decreases with depth into Earth.
Toysmith Spring Ring Game. Here is a super fun game the kids might like. Nordstrom has this Toysmith Spring Ring Game for $14.98! That is down from the normal price of $24.99, for a 40% savings.
$ 34.97 1965 - 1998 Washington Quarter Coin Ring - Birth Year Coin Ring - Sizes 4.5-10 Standard design will have the heads side of the ring on the outside. If you prefer tails on outside please email or call me after your order is placed. These rings are hand crafted and made specific for you.